Autonomous robotic salesmen - salesrobots - are the bane of consumers in this Dick classic.

Robot-salesmen were everywhere, gesturing, pleading, shrilling. One started after him and he quickened his pace. It scurried along, chanting its pitch and trying to attract his attention, all the way up the hill to his living-unit. It didn't give up until he stooped over, snatched up a rock, and hurled it futilely. He scrambled in the house and slammed the doorlock after him. The robot hesitated, then turned and raced after a woman with an armload of packages toiling up the hill. She tried vainly to elude it, without success.

The picture is taken from the original story as it appeared in the magazine.

This story has too many good quotes to pass up:

Morris pushed wearily past the salesrobot, up the sidewalk toward the residential-block that contained his living-unit. The robot followed a few steps, then forgot him and hurried after another grim-faced commuter.

Sales robots are also in use in Stanislaw Lem's 1961 novel Return from the Stars.